[R] Regression expression to delete one or more spaces at end of string
fisher at plessthan.com
Tue Aug 2 18:46:15 CEST 2016
I have encountered an unexpected regex problem
I have read an Excel file into R using the readxl package. Columns names are:
COLNAMES <- c("Study ID", "Test and Biological Matrix", "Subject No. ", "Collection Date",
"Collection Time", "Scheduled Time Point", "Concentration", "Concentration Units",
"LLOQ", "ULOQ", "Comment”)
As you can see, there is a trailing space in “Subject No. “. I would like to delete that space. The following works:
sub(“ $”, “”, COLNAMES)
However, I would like a more general approach that removes any trailing whitespace.
I tried variations such as:
sub("[:blank:]$", "", COLNAMES)
(also, without the $ and ‘space' instead of ‘blank') without success — to my surprise, characters other than the trailing space were deleted but the trailing space remained.
Guidance on the correct syntax would be appreciated.
Dennis Fisher MD
P < (The "P Less Than" Company)
Phone / Fax: 1-866-PLessThan (1-866-753-7784)
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